// 获取滚动条当前的位置
export function getScrollTop(node) {
  var scrollTop = 0
  const domNode = document.querySelector(node)
  scrollTop = domNode.scrollTop
  return scrollTop
}

// 获取当前可视范围的高度
export function getClientHeight() {
  var clientHeight = 0
  if (document.body.clientHeight && document.documentElement.clientHeight) {
    clientHeight = Math.min(document.body.clientHeight, document.documentElement.clientHeight)
  } else {
    clientHeight = Math.max(document.body.clientHeight, document.documentElement.clientHeight)
  }
  return clientHeight
}

// 获取文档完整的高度
export function getScrollHeight(node) {
  const domNode = document.querySelector(node)
  return Math.max(domNode.scrollHeight, domNode.scrollHeight)
}
